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On the various time constants of wavelength changes of a DFB laser under direct modulation

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6 Author(s)
Shalom, H. ; Fac. of Eng., Tel Aviv Univ., Israel ; Zadok, A. ; Tur, M. ; Legg, P.J.
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The temporal behavior of the optical frequency emitted by several DFB lasers under direct square wave modulation was measured using an all-fiber implementation of a Mach-Zender interferometer with an imbalance of 30 ps. The impulse response of the optical frequency to injection current modulation was found to contain a time constant as short as 10-20 ns, together with a few longer ones. The existence of such a short time constant is consistent with a thermal analysis of a laser structure with finite thermal impedance of the active region and should be taken into consideration in various wide bandwidth applications of direct modulated semiconductor lasers

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Quantum Electronics, IEEE Journal of  (Volume:34 ,  Issue: 10 )